budibase/packages/client/src/api/index.js

import { ERROR } from "../state/standardState";
import {loadRecord} from "./loadRecord";
import {listRecords} from "./listRecords";

export const createApi = ({rootPath, setState, getState}) => {

    const apiCall = (method) => ({url, body, notFound, badRequest, forbidden}) => {
        fetch(url, {
            method: method,
            headers: {
                'Content-Type': 'application/json',
            },
            body: body && JSON.stringify(body), 
            credentials: "same-origin"
        }).then(r => {
            switch (r.status) {
                case 200:
                    return r.json();
                case 404:
                    return error(notFound || `${url} Not found`);
                case 400:
                    return error(badRequest || `${url} Bad Request`);
                case 403:
                    return error(forbidden || `${url} Forbidden`);
                default:
                    if(r.status.toString().startsWith("2")
                        || r.status.toString().startsWith("3"))
                        return r.json()
                    else
                        return error(`${url} - ${r.statusText}`);
            }
        });
    }

    const post = apiCall("POST");
    const get = apiCall("GET");
    const patch = apiCall("PATCH");
    const del = apiCall("DELETE");

    const ERROR_MEMBER = "##error";
    const error = message => {
        const e = {};
        e[ERROR_MEMBER] = message;
        setState(ERROR, message);
        return e;
    }

    const isSuccess = obj => !!obj[ERROR_MEMBER];

    const apiOpts = {
        rootPath, setState, getState, isSuccess, error,
        post, get, patch, delete:del
    };

    return {
        loadRecord:loadRecord(apiOpts), 
        listRecords: listRecords(apiOpts)
    }
}